fix empty error issue

packages/insomnia/src/common/mcp-utils.test.ts

@@ -32,11 +32,11 @@ const incomingResult = (method: string, id: number, result: unknown): McpEvent =
     data: { jsonrpc: '2.0', id, result },
   }) as McpEvent;
 
-const incomingErrorEvent = (id: number, message: string): McpEvent =>
+const incomingErrorEvent = (id: number, title: string, message: string): McpEvent =>
   ({
     ...BASE,
     type: 'error',
-    message,
+    message: title,
     error: { code: -32_601, requestId: id, message },
   }) as McpEvent;
 
@@ -87,17 +87,9 @@ describe('findLatestListResult', () => {
   });
 
   it('surfaces a JSON-RPC error response as an error', () => {
-    const events = [outgoing(METHOD_LIST_TOOLS, 1), incomingErrorEvent(1, 'Method not found')];
+    const events = [outgoing(METHOD_LIST_TOOLS, 1), incomingErrorEvent(1, 'Error', 'Method not found')];
 
-    expect(findLatestListResult(events, METHOD_LIST_TOOLS)).toEqual({ error: { title: 'Method not found' } });
-  });
-
-  it('falls back to a default message when the error event carries none', () => {
-    const events = [outgoing(METHOD_LIST_TOOLS, 1), incomingErrorEvent(1, '')];
-
-    expect(findLatestListResult(events, METHOD_LIST_TOOLS)).toEqual({
-      error: { title: `MCP server returned an error for ${METHOD_LIST_TOOLS}` },
-    });
+    expect(findLatestListResult(events, METHOD_LIST_TOOLS)).toEqual({ error: { title: 'Error: Method not found' } });
   });
 
   it('returns the result untouched when it matches the schema', () => {

packages/insomnia/src/common/mcp-utils.ts

@@ -353,7 +353,11 @@ export const findLatestListResult = (mcpEvents: McpEvent[], method: string): Mcp
     return undefined;
   }
   if (incomingEvent.type === 'error') {
-    return { error: { title: incomingEvent.message || `MCP server returned an error for ${method}` } };
+    return {
+      error: {
+        title: `${incomingEvent.message || 'Error'}: ${incomingEvent.error?.message || `MCP server returned an error for ${method}`}`,
+      },
+    };
   }
   if (incomingEvent.type !== 'message') {
     return undefined;

packages/insomnia/src/ui/components/mcp/mcp-pane.tsx

@@ -69,7 +69,7 @@ const emptyPrimitiveErrors: Partial<Record<McpServerPrimitiveTypes, McpListValid
 const ITEM_ROW_HEIGHT = 32;
 // A whole-response failure has no per-entry breakdown, just a one-line title, so it needs far less
 // room than a partial failure's scrollable list of dropped entries.
-const ERROR_PANEL_HEIGHT_TITLE_ONLY = 80;
+const ERROR_PANEL_HEIGHT_TITLE_ONLY = 100;
 const ERROR_PANEL_HEIGHT_WITH_ENTRIES = 120;
 
 const getErrorPanelHeight = (error: McpListValidationError | undefined): number =>